參數(shù)資料
型號(hào)： DS14285SN
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： Timer or RTC
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO24
封裝： 0.300 INCH, SOP-24
文件頁數(shù)： 5/26頁
文件大?。?/td> 515K
代理商： DS14285SN
DS14285/DS14287
13 of 26
NONVOLATILE RAM
The 114 general-purpose nonvolatile RAM bytes are not dedicated to any special function within the
DS14285/DS14287. They can be used by the processor program as nonvolatile memory and are fully
available during the update cycle.
The DS14285/DS14287 can also provide additional nonvolatile RAM. This is accomplished through the
use of its internal lithium cell in the case of the DS14287 (or the energy source connected to the VBAT pin
in the case of the DS14285) and battery-backup controller to make a standard CMOS SRAM nonvolatile
during power-fail conditions. During power-fail, the DS14285/DS14287 automatically write-protects the
external SRAM and provides a VCC output sourced from the internal lithium cell. The interface between
the DS14285/DS14287 and an external SRAM is illustrated in Figure 3.
Figure 3. External SRAM Interface to the DS14285/DS14287 RTC
INTERRUPTS
The RTC plus RAM includes three separate, fully automatic sources of interrupt for a processor. The
alarm interrupt can be programmed to occur at rates from once per second to once per day. The periodic
interrupt can be selected for rates from 500 ms to 122
s. The update-ended interrupt can be used to
indicate to the program that an update cycle is complete. Each of these independent interrupt conditions is
described in greater detail in other sections of this text.
The processor program can select which interrupts, if any, are going to be used. Three bits in Register B
enable the interrupts. Writing a logic 1 to an interrupt-enable bit permits that interrupt to be initiated when
the event occurs. A 0 in an interrupt-enable bit prohibits the IRQ pin from being asserted from that
interrupt condition. If an interrupt flag is already set when an interrupt is enabled, IRQ is immediately set
at an active level, although the interrupt initiating the event may have occurred much earlier. As a result,
there are cases where the program should clear such earlier initiated interrupts before first enabling new
interrupts. When an interrupt event occurs, the relating flag bit is set to logic 1 in Register C. These flag
bits are set independent of the state of the corresponding enable bit in Register B. The flag bit can be used
in a polling mode without enabling the corresponding enable bits. The interrupt flag bit is a status bit
which software can interrogate as necessary. When a flag is set, an indication is given to software that an
interrupt event has occurred since the flag bit was last read; however, care should be taken when using the
相關(guān)PDF資料
PDF描述
DS14285Q 1 TIMER(S), REAL TIME CLOCK, PQCC28
DS14285 1 TIMER(S), REAL TIME CLOCK, PDIP24
DS1670S 0 TIMER(S), REAL TIME CLOCK, PDSO20
DS14287 1 TIMER(S), REAL TIME CLOCK, PDIP24
DS1670E 0 TIMER(S), REAL TIME CLOCK, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS14285SN/T&R 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL IND 24SOIC
DS14285SN/T&R 功能描述:IC RTC W/NV RAM CNTRL IND 24SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
DS14285SN/TR 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Real-Time Clock with NV RAM
DS14285SN+ 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS14285SN+T&R 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC 制造商:DSC 功能描述:
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